I am failing to see how this is great. Sorry but didn't just Adobe fix all their issues with cross platform AIR and Stage3D? Adobe's demos are stunning... this

I am failing to see how this is great. Sorry but didn't just Adobe fix all their issues with cross platform AIR and Stage3D? Adobe's demos are stunning... this is rather.. underwhelming. Also I'd rather invest in a proven technology with many resources on tap than yet-another-frameworkish-lang. Is this running Dart?